Revert of MSE: Relax the 'media segment must begin with keyframe' requirement

media/formats/mp2t/mp2t_stream_parser.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/formats/mp2t/mp2t_stream_parser.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 162 matching lines @@
     const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
     const NewMediaSegmentCB& new_segment_cb,
     const EndMediaSegmentCB& end_of_segment_cb,
     const scoped_refptr<MediaLog>& media_log) {
   DCHECK(!is_initialized_);
   DCHECK(init_cb_.is_null());
   DCHECK(!init_cb.is_null());
   DCHECK(!config_cb.is_null());
   DCHECK(!new_buffers_cb.is_null());
   DCHECK(!encrypted_media_init_data_cb.is_null());
-  DCHECK(!new_segment_cb.is_null());
   DCHECK(!end_of_segment_cb.is_null());
 
   init_cb_ = init_cb;
   config_cb_ = config_cb;
   new_buffers_cb_ = new_buffers_cb;
   encrypted_media_init_data_cb_ = encrypted_media_init_data_cb;
   new_segment_cb_ = new_segment_cb;
   end_of_segment_cb_ = end_of_segment_cb;
   media_log_ = media_log;
 }
@@ skipping 451 matching lines @@
   // so that buffers with the same config can be added later on.
   BufferQueueWithConfig queue_with_config(
       true, last_audio_config, last_video_config);
   buffer_queue_chain_.push_back(queue_with_config);
 
   return true;
 }
 
 }  // namespace mp2t
 }  // namespace media